因式分解(分组分解)
1.(2x^3-4)+(x^2-8x)2.x^3-x^2-x+13.4m^2-x^2-9-6x4.(x^2-y^2)+(6y-9)5.a^2+2ab+b^2-2a-2b+...
1.(2x^3-4)+(x^2-8x)
2.x^3-x^2-x+1
3.4m^2-x^2-9-6x
4.(x^2-y^2)+(6y-9)
5.a^2+2ab+b^2-2a-2b+1 展开
2.x^3-x^2-x+1
3.4m^2-x^2-9-6x
4.(x^2-y^2)+(6y-9)
5.a^2+2ab+b^2-2a-2b+1 展开
4个回答
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1.(2x^3-4)+(x^2-8x)
=2x^3+x^2-8x-4
=x^2(2x+1)-4(2x+1)
=(2x+1)(x^2-4)
=(2x+1)(x-2)(x+2)
2.x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x-1)(x^2-1)
=(x-1)(x-1)(x+1)
=(x-1)^2(x+1)
3.4m^2-x^2-9-6x
=4m^2-(x^2+6x+9)
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4.(x^2-y^2)+(6y-9)
=x^2-y^2+6y-9
=x^2-(y^2-6y+9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5.a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
=2x^3+x^2-8x-4
=x^2(2x+1)-4(2x+1)
=(2x+1)(x^2-4)
=(2x+1)(x-2)(x+2)
2.x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x-1)(x^2-1)
=(x-1)(x-1)(x+1)
=(x-1)^2(x+1)
3.4m^2-x^2-9-6x
=4m^2-(x^2+6x+9)
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4.(x^2-y^2)+(6y-9)
=x^2-y^2+6y-9
=x^2-(y^2-6y+9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5.a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
展开全部
1:(2x^3-4)+(x^2-8x)
=2x^3-4+x^2-8x
=2x^3-8x+x^2-4
=2x(x^2-4)+(x^2-4)
=(2x+1)(x^2-4)
=(2x+1)(x+2)(x-2)
2:x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x^2-1)(x-1)
=(x+1)(x-1)(x-1)
=(x+1)(x-1)^2
3:4m^2-x^2-9-6x
=4m^2-(x^2+9+6x)
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4:(x^2-y^2)+(6y-9)
=x^2-(y^2-6y+9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5:a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
=2x^3-4+x^2-8x
=2x^3-8x+x^2-4
=2x(x^2-4)+(x^2-4)
=(2x+1)(x^2-4)
=(2x+1)(x+2)(x-2)
2:x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x^2-1)(x-1)
=(x+1)(x-1)(x-1)
=(x+1)(x-1)^2
3:4m^2-x^2-9-6x
=4m^2-(x^2+9+6x)
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4:(x^2-y^2)+(6y-9)
=x^2-(y^2-6y+9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5:a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
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展开全部
1.(2x^3-4)+(x^2-8x)
=x^2(2x+1)-4(2x+1)
=(2x+1)(x^2-4)
=(2x+1)(x+2)(x-2)
2.x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x-1)(x^2-1)
=(x-1)^2(x+1)
3.4m^2-x^2-9-6x
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4.(x^2-y^2)+(6y-9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5.a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
=x^2(2x+1)-4(2x+1)
=(2x+1)(x^2-4)
=(2x+1)(x+2)(x-2)
2.x^3-x^2-x+1
=x^2(x-1)-(x-1)
=(x-1)(x^2-1)
=(x-1)^2(x+1)
3.4m^2-x^2-9-6x
=4m^2-(x+3)^2
=(2m+x+3)(2m-x-3)
4.(x^2-y^2)+(6y-9)
=x^2-(y-3)^2
=(x+y-3)(x-y+3)
5.a^2+2ab+b^2-2a-2b+1
=(a+b)^2-2(a+b)+1
=(a+b-1)^2
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(2x^3-4)+(x^2-8x)=2X^3-8X+X^2-4=2X(X^2-4)+(X^2-4)=(2X+1)(X+2)(X-2)
x^3-x^2-x+1=(X^3-X)-(X^2-1)=X(X^2-1)-(X^2-1)=(X+1)(X-1)^2
4m^2-x^2-9-6x=4m^2-(x^2+6x+9)=4m^2-(x+3)^2=(2m+x+3)(2m-x-3)
(x^2-y^2)+(6y-9)=x^2-(y^2-6y+9)=x^2-(y-3)^2=(x+y-3)(x-y+3)
a^2+2ab+b^2-2a-2b+1=(a+b)^2-2(a+b)+1=(a+b-1)^2
x^3-x^2-x+1=(X^3-X)-(X^2-1)=X(X^2-1)-(X^2-1)=(X+1)(X-1)^2
4m^2-x^2-9-6x=4m^2-(x^2+6x+9)=4m^2-(x+3)^2=(2m+x+3)(2m-x-3)
(x^2-y^2)+(6y-9)=x^2-(y^2-6y+9)=x^2-(y-3)^2=(x+y-3)(x-y+3)
a^2+2ab+b^2-2a-2b+1=(a+b)^2-2(a+b)+1=(a+b-1)^2
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